SHE is best-known for playing Margaery Tyrell in HBO's Game of Thrones, but Natalie Dormer has revealed that she originally auditioned for a different character.

The 32-year-old actress made the revelation during an interview on The Jonathan Ross Show, but wouldn't go into any more details.

"The story of that is, I went in to audition for another role and I’ve never told anyone what that other role and I won’t tell anyone while we’re still shooting the show," she told the chat show host.

She added: "It was serendipity that they didn’t really know what to do with Margaery Tyrell because she’s kind of a weird one in the books.

"There’s not really much about her so I had to flesh her out and to make her a three dimensional character within the show. I had watched the first season of Thrones and like you [Jonathan] I was just like 'I’m in!'"

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The actress revealed that she originally auditioned for another Game of Thrones role

The story of that is, I went in to audition for another role and I’ve never told anyone what that other role and I won’t tell anyone while we’re still shooting the show

Natalie Dormer

Natalie also spoke about the scene with in season four where Margaery has to flirt with Martyn Lannister - who is played by Dean-Charles Chapman.

"DC, as I affectionately call him, Dean Charles, was 16 at the time," she explained.

"It was very awkward for me, I had a whole conversation about how that scene was written, I kind of altered how that scene was written.

"It wasn’t as ambiguous and I was like 'we need to talk about this' and for a woman just to throw her sensuality, her sexuality at a young male is just so on the nose and so obvious and the last thing Margaery Tyrell is is obvious, she’s far more skilled than that.

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Natalie was joined by Stanley Tucci who donned a wimple hat on the show

"I think she’d make a brilliant psychotherapist. I have this theory that she’d be the best therapist ever."

She and Jonathan then had a brief conversation about the costume of Dame Diana Rigg who plays Natalie’s grandmother in the show.

Jonathan then enlisted Natalie's Hunger Games co-star Satnley Tucci to don a wimple hat, as well as Frank Skinner who was sat in the green room.

The full interview with Natalie can be seen on The Jonathan Ross Show on Saturday November 8 at 9.45pm on ITV1.